[Gallium: an alternative for amalgam?].

: Some of the physical properties of gallium-based dental alloys for restorative goals equal those of dental silver amalgam, but the results of the relatively few and short-term studies of their clinical behaviour differ. Corrosion, discoloration, rough surface, expansion and fractures of the margins and possibly the teeth, may pose serious problems and are assessed to make the clinical use premature. Handling characteristics are less favourable than for silver amalgam. Gallium alloys release a substantial amount of gallium. Results of toxicity studies with cell cultures differ. Compared to some brands of silver amalgams the alloys seem to be somewhat more cytotoxic during a longer period of time. However, the gallium released by the restorations would be insufficient to harm the patients. Implants of (early) alloys evoked more serious reactions than silver amalgam. Sensitization is not reported, but few restorations have been made and allergic studies are scarce.